Safety razor



April 21, 1936. G. w. RYDNER 2,037,927

SAFETY RAZOR Filed June 8, 1934 'ATTORNEY Patented Apr. 21, 1936 UNITED kSTATES PATENT OFFICE SAFETY RAZGB Gusta! W. Rydner, Detroit, Mich. Application June" 8, 1934, Serial No. 129,648

Claims.

My invention relates to a new and useful im provement in a safety razor and has for its object the provision of a safety razor in which a detachable blade may be slid into position and 5 out of position on a back slidable onto a supporting head.

In the present type of structure, there is provided a blade stop which will engage the blade and definitely secure the blade in position so that the slidable back plate is held in position by the frictional engagement of the stop with the blade.

Another object of the invention is the provision of a safety razor so constructed that both the back and the supporting head or guard can be molded or cast in a die without requiring loose pieces in the die.

Another object of the invention is the provision in a safety razor of a guard plate or head having guard teeth rounded on the side facing the blade,

thus facilitating the passage of lather and air past the guard teeth.

Another object of the invention is the provision in a blade, having a back slidable into position and out of position, of means for adjusting the tension of the blade.

Another object of the invention is the provision of a device of this class which will be simple in structure, economical 'of manufacture, durable, highly emcient in use, and easily and quickly assembled and disassembled.

Another object of the invention is the provision of a blade having abutment portions in engagement with an abutment member carried by the handle.

Other objects will appear hereinafter.

\ 'Ihe invention consists in the combination and arrangement of parts hereinafter described and claimed,

The invention will be best understood by a reference to the accompanying drawing, which forms a part of this specification, and in which,

Fig. 1 is a central, transverse, sectional view of the invention.

Fig. 2 is a fragmentary sectional view, taken v transversely of the invention, slightly at one side of the support.

Fig. 3 is a view taken on line 3--3 of Fig. 2. Fig. 4 is a transverse sectional view of the back plate used in the invention. Fig. 5 is an end elevational view of the blade.

Fig. 6 is a side elevational view of the back plate used in the invention, with parts broken away.

Fig. 7 is a transverse sectional view of a modified form of the invention,

Fig. 8 is a fragmentary enlarged sectional view taken on line 8-8 of Fig. 1.

Fig. 9 is a plan view of the blade used in the invention.

Fig. 10 is a plan view of another type of blade 5 used in the invention.

Fig. 11 is a diagrammatic, plan view in fragment, showing a blade in assembly.

Fig. 12 is a fragmentary transverse sectional view of a modified form of holder. 10

Fig. 13 is an end elevational view of the blade. Fig. 14 is a transverse sectional view of the back plate used with the holder shown in Figs. 12, 13 and 14, constituting an exploded view.

Fig. 15 is a side elevational view of the back 15 plate shown in Fig. 14.

Fig. 16 is a fragmentary view taken on line I6-I6 of Fig. 12.

Fig. 17 is a view of the form shown in Fig. 12, similar to Fig. 3. 20 Fig. 18 is a. plan view of a blade used with the form shown in Fig. 1,

Fig. 19 is a plan view of a blade used with the form shown in Fig. 1.

Fig. 20 is a modified form of blade, used with 25 4 the form shown in Fig. l2.

Fig. 21 is an end elevational view of the blade shown in Fig. 20.

In the form shown in Fig. 1, the device comprises a handle 21 carrying a head comprising 30 the laterally extending arms 23 and 29 connected by the frame 30, projecting inwardly from which are the elongated teeth 3| and the short teeth 32. A central rib 33 is provided at spaced intervals with the laterally extending lugs 34 and 3l 35. Extending centrally upwardly from the rib 33 is a boss 36. Tins comprises the guard portion of the razor and is designed to cooperate with the back plate 31 having the downwardly projecting flanges 38 and 39, each of which is 4. provided with the inturned portion 40 adapted to straddle the rib 33 and engage beneath the lugs 34 and 35, so that the device may be slid inwardly from the sides.

The back plate is provided centrally of its under 4l surface with a boss 4I and also with spaced openings 42. The construction is such that when the blades 43 is slid into position between the flanges 38 and 33, and the device slid on to the guard portion of the handle, the bosses 4I will lie on op- 50 posite sides of the boss 38 so that the parts are retained in position. The edges of the bosses 4i are formed beveled so that they may slide over the boss 36 when the necessary pressure is exerted. When the back plate with the blade posi- 55 tioned thereon is slipped into position, the blade, through the engagement with the boss 36, will serve to be locked in position releasably, so that undue displacement of the parts may be prevented.

In the types of blades shown in Fig.' 9 and Fig. 10, and Figs. 18 and 19, and clearly illustrated in Fig. 11, the boss 36 serves an important function. In the blade 44 I have cut away a portion of theblade as at 45, and extending into 4this cut-away portion are the prongs 46 and 41 so arranged that when the back plate is slipped into position with the guard, these prongs 46 and 41 will engage opposite sides of the boss 36, as clearly shown in the enlarged diagrammatic view in Fig. 11. Similarly, with the blade 48, the boss 36 will engage in the cut-away portion 49 so as to prevent lateral displacement. It is thus obvious that while there are no screw parts in this particular type of razor, and the back is slid onto the guard portion of the holder, the device is held securely in position. In slipping the device into position the prongs 46 and 41, or the body of the blade 48 will ride over the boss 36, and then slip into position. As shown in Fig. 6, there are a pair of the bosses 4I spaced at opposite sides of the transverse medial line of the back plate. As shown in Fig. 1l, these bosses 4I are positioned at opposite sides of the boss 36 and serve to exert sufiicient pressure to provide the snapping-over action.

Excessive pressure exerted on the ends of the blades from either side will cause the desired sliding movement of the back plate and the blade from position on the guard portion of the holder. It will be noted from Fig. 11 that the ends of the blade project slightly beyond the back plate and the holder, these ends being cut-away at the opposite edges, so that the projecting portion is not sharpened.

In the form shown in Fig. 7, the construction is similar to the form shown in Fig. l, excepting that certain parts are movable in the structure shown in Fig. 7.

In the form shown in Fig. '1, instead of the outwardly projecting lugs 34 and 35 being formed integral with the head or guard portion of the holder, I provide a movable rib 5U, having the laterally projecting lugs 5| and 52 which function as do the lugs 34 and 35. Threaded into this rib 50 is a stem 53 which is fixed to the knob 54, so that a rotation of the knob 54 will serve to move the rib 50 downwardly, carrying the back plate `31 with it and thus placing the blade 43 under tension. As shown in Fig. 8, at each end of the rib 50 there is provided a iiange 55 which engages opposite ends of the crosshead 56, carried by the handle 21.

Secured on the knob 54 are a pair of spring strips 56, each of which carries a glass ball 51 held in contact with each other to provide a sharpening device on the end of the razor handle.

In the form of holder shown in Figs. 12, 13, and 14, the back plate 31' is provided with a central rib 58 carrying the T 59. The back plate 31 is provided with the openings 42'. As shown in Fig. l5, a pair of these Ts is provided at opposite ends of the back plate 31 and the blade 60 shown in Fig. 18 is provided, by being cut away as at 13, with a pair of resilient tongues 14 and 15 which will snap over the boss 36 shown in the preferred form. Each of these tongues is also cut away as at 16 to provide a clamp for the bosses 4|. The blade 62 shown in Fig. 19 is cut away as at 11 to provide the ribs 18 and 19 which serve to snap over the boss 36. The c ut away portions serve as a clearance for the bosses 4I. These cut away portions 80, as well as the cut away portion 13 and the cut away portion 45 shown in Fig. 9, and the openings 8| shown in Fig. 10, afford a clearance for the gripping legs 38 and 39, and through the blade at these points the lugs are projected when in operative position. The T 59 engages in the space 63 and the rib 58 will pass through the space 64. The boss 36' functions as does the boss 36, and the Ts 59 function as do the bosses 4I in the preferred form.

With the blade 6I shown in Fig. 20 the locking effect of the bosses may be dispensed with and small tips 65 formed on opposite ends of the blade will serve to snap over the end edges of the holder and the back, so as to prevent longitudinal displacement.

In all of the forms, as clearly illustrated in Fig. 16, the teeth 32 are formed round on both sides, and as shown in Fig. 1, the teeth are rounded on one side. This facilitates the passage of the lather and shavings through the openings and the teeth so as to afford an easier and smoother shave.

The advantage of the constructions illustrated is, in addition to the smoother and cleaner shave. the provision of a razor whereby the blade may be slid into position and out of position, and yet yieldable held in position to prevent undue displacement. Furthermore, the parts arereduced to al minimum and it becomes possible to die cast the structure without any loose parts in the die. The razor is also believed one which may be economically manufactured, while at the same time it is light and easily manipulated when being used.

While I have illustrated and described the preferred form of construction of my invention, I do not wish to limit myself to the precise details of structure shown, but desire to avail myself of such variations and modifications as may come within the scope of the appended claims.

Having thus described my invention what I claim is new and desire to secure by Letters Patent is: y

1. A safety razor of the class described, com-- prising: a handle; a head carried on one end of said handle; a backing plate; ledge-forming means on said head; inwardly-turned engaging means on said backing plate engageable beneath said ledge-forming means for mounting said backing plate on said head, said backing plate being slidable into position on said head; a blade positioned between said backing plate and said head; an outwardly projecting boss on said head engageable with said blade, said blade having a cut-away portion for snapping over said boss when moved into position and spaced bosses on said backing plate at opposite sides of said outwardly projecting boss for resisting longitudinal displacement of said backing plate.

2. A safety razor of the class described, comprising: a handle; a head carried on one end of said handle; a backing plate; ledge-forming means on said head; inwardly-turned engaging means on said backing plate engageable beneath said ledge-forming means for mounting said backing plate on said head, said backing plate being slidable into position on said head; a blade positioned between said backing plate and said head; an outwardly projecting boss on said head engageable with said blade, said blade having a cut-away portion for snapping over said boss when moved into position; spaced bosses on said backing plate at opposite sides of said outwardly projecting boss for resisting longitudinal displacement of said backing plate and means for adjusting the tension of said backing plate on said blade.

3. A safety razor comprising: aA handle; a head mounted on one end of said handle; a centrally disposed rib on said head extending longitudinally thereof; outwardly projecting ledgeforming means on opposite sides of said rib adjacent its outer end; a backing plate mountable on said head; inwardly projecting means on said backing plate engageable below said ledge-forming means for securing said backing plate on said head, said backing plate being slidable longitudinally on said head into position thereon; a blade positioned between said backing plate and said head; a boss projecting centrally outwardly from said rib engageable with said blade; spaced means on said backing plate at opposite sides of said outwardly projectingl boss for resisting longitudinal displacement of said backing plate and pressing the same toward said head; and means on said blade engageable with opposite sides of said boss for resisting longitudinal movement of said blade, said means being snapped over said boss.

4. A safety razor comprising: a handle; a head mounted onone end of said handle; a centrally disposed rib on said head extending longitudinally thereof; outward projecting ledge-forming means on opposite sides of said rib adjacent its outer end; a backing plate mountable on saidhead; inwardly projecting means on said backing plate engageable below said ledge-forming means for securing said backing plate on said head, said backing plate being slidable longitudinally on said head into position thereon; a blade positioned between said backing plate and said head; spaced means on said backing plate for exerting pressure on said blade and pressing the same toward said head; a boss projecting centrally outwardly from said rib engageable with said blade; and means on said blade engageable with opposite sides-of said boss for re sisting longitudinal movement of said blade, said means being snapped over said boss; and means for adjusting the tension on said blade.

5. A safety razor comprising: a handle; a head on one end of said handle; a backing plate; a

centrally disposed longitudinally extending rib on said head; outwardly projecting ledge forming means on said rib on opposite sides of its upper edge; a blade positioned on said head; inwardly turned means on said backing plate engageable beneath said ledge forming means for securing said backing plate in position on said head and retaining the blade in position, said backing plate being slidable into position on said head; an outwardly projecting boss on said head engageable with said blade, said blade having a cut-away portion for snapping over said boss when moved into position; means carried by said backing plate at opposite sides of said boss for resisting longitudinal displacement of said backing plate; and

vmeans for adjusting the tension of said backing plate on said blade.

GUSTAF W. RYDNER. 

